Senior Manager, Mechanical Engineering Vacuum Vessel

Commonwealth Fusion Systems LLC; Massachusetts; On-site; USD 170,000 - 230,000; Full time

Benefits offered by this job

13 Company-wide Holidays

Flexible vacation days

Generous parental leave policy

Health, dental, and vision insurance

Professional growth opportunities

Team-building activities

Job summary

Commonwealth Fusion Systems is seeking a Senior Manager, Mechanical Engineering to lead the design and delivery of the ARC vacuum vessel. You will oversee the full lifecycle from concept through assembly and interfaces with multiple engineering teams.

Ideal candidates have 10+ years in mechanical engineering, experience with large metallic structures and structural analysis, and a strong background in R&D environments with novel materials. Safety and schedule discipline are essential.

Qualifications

• Bachelor's degree in Mechanical Engineering or closely related field.
• 10+ years of mechanical engineering experience.
• Experience delivering large metallic structures.
• Experience with structural analysis and finite element methods.
• Experience with fabrication of large structures.
• Experience in dynamic R&D environments with novel materials.
• Willingness to travel nights/weekends/on-call.
• Commitment to safety in hazardous environments.

Responsibilities

• Lead a team of mechanical engineers to plan and deliver the ARC vacuum vessel and connected systems.
• Oversee the full design lifecycle from concept and CAD modeling to procurement and assembly.
• Interface vacuum vessel design with other ARC plant systems, coordinating with engineering teams.
• Provide hands-on technical leadership to solve complex design challenges and manage risks.
• Collaborate with supply chain and materials teams to identify suppliers for the vacuum vessel.
• Proactively manage schedule and budget to deliver a critical component to the ARC plant.
• Manage all aspects of the group's talent, including hiring, training, and performance expectations.

Skills

Team leadership

Mechanical engineering

Project management

Finite element analysis

Structural analysis

Fabrication

Supplier development

Safety compliance

Education

Bachelor's in Mechanical Engineering

Tools

CAD

Job description

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And we're working with policymakers, suppliers, and many others to build the energy industry of the future.

Join the power movement as a Senior Manager, Mechanical Engineering

CFS is looking for a creative, experienced mechanical engineering manager to lead the design and delivery of the ARC vacuum vessel. Commonwealth Fusion Systems is currently designing the ARC fusion power plant. Within the ARC plant, the ARC tokamak consists of many large mechanical structures that support the large loads and extreme conditions of the fusion plasma. One of the newest and most interconnected components in ARC will be the vacuum vessel, a hundred-ton mechanical structure that surrounds the fusion plasma. This structure must withstand extreme heat fluxes on the plasma-facing side and effectively remove this heat via flowing molten salt on the other side of the vessel. This vessel must also be replaceable via a remote handling system during regular plant maintenance cycles. Come lead the design of a critical portion of the world's first fusion power plant!

Lead a team of mechanical engineers to plan and deliver on the ARC vacuum vessel and connected systems

Oversee the full design lifecycle, from initial concept and CAD modeling to hardware procurement and assembly

Interface the design of the vacuum vessel with many other systems in the ARC plant, coordinating with other engineering teams to ensure the best overall design for the product

Provide hands‑on technical leadership to solve complex, multi‑disciplinary design challenges and manage risks in new environments and with novel materials

Work with the supply chain and materials and processing teams to identify and develop suppliers for the vacuum vessel

Proactively manage schedule and budget to deliver a critical component to the ARC fusion power plant

Manage all aspects of the group's talent, including hiring, training, and setting clear performance expectations

Bachelors Degree in Mechanical Engineering or a closely related degree

~10+ years experience in mechanical engineering or closely related fields

~ Experience working on a multi-disciplinary engineering project

~ Experience designing and delivering large metallic structures

~ Experience with structural analysis

~ Experience with fabrication of complex large structures

~ Experience working in dynamic R&D environments, including novel materials and locations

~ Broad knowledge of engineering sufficient to interact with multi-disciplinary engineering teams

~ Knowledge of finite element structural analysis

~ Knowledge of fluid cooling of mechanical structures

~ Bonus points for:

~ Willingness to occasionally travel or work required nights/weekends/on-call

Dedication to safety to mitigate hazards that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics

Salary range for this full-time position + equity + benefits . Competitive compensation with equity

• 13 Company-wide Holidays
• Flexible vacation days
• Generous parental leave policy
• Health, dental, and vision insurance
• Professional growth opportunities
• Team-building activities

At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.